Steam generator heating unit



April 30, 1929. J. B. oni-:LL

STEAM GENERATOR HEATING UNIT Filed April 18. 1928 Patented Apr. 30, 1929.

TUI-IN B. ODELL, GF RIVERSIDE, CALIFORNIA.

PATENT OFFICE.

STEAM-GENERATOR HEATING UNIT.

Application filed April 18, 1928.

rlhis invention relates to electric heating units and more especially'to electric steam generator units for apparatus of the kind shown in my Patent #1,662,935, March 20, 1928.

An obiect of my invention is to provide a novelun'it whereby to obtain a high heating eiiiciency tor the qiiick and continuous generation steam, more especially in domestic steam radiators employing electric energy as the source of heat.

More particularly an object is to provide a heating unit of such construction that heat is transmitted to and absorbed by both upper and lower stretches of coil ot tube enclosing resistance coils or" the unit.

A further object is to provide a mount for the resistance coils wherein the coils are rove to and fro and are disposed within a wrapping coil of water tube.

Other objects, advantages and features of construction, combination and details of means will be made manifest in the ensuing description ot' the herewith illustrative embodiment; it being understood that modifications, variations and adaptations may be resorted to within the spirit, scope and principle of the invention as it is more directly claimed hereinafter.

Figure 1. is a plan of the installed unit.

Figure 2 is a cross section of the resistance mount.

Figure 3 is a longitudinal. edge. View ot the mount.

Figure l is a detail view et a terminal sl'iring contact, and

Figure 5 is a detail of its plug blade.

Figure G is a' centra-l section oit a threeway plug socket.

Figure 7 is a face view thereof, and

Figure 8 is a. sectional view of the threeway plug. Y

In the above referred to patent a heating unit is adapted to be readily inserted and removed under a steam radiator; the unit-s being placed beneath a set of water conduits which are to be heated to supply steam to the radiator shell.

My present invention has for its broad ob ject to lprovide a highly eilieient form of steam generating electric unit, and to provide a plural-section resistance wire wherein the different sections of the resistance wire are parallel connected in a three-way Wire electric system.

The unit includesra rectangular frame 2 Serial No. 270,908.

preferably of a tire-resistive glass ot kinds now in common use for cooking utensils. This frame, or mount, is provided with suitable cross-webs 3 shown as having acute upper edges at on which rest the cross stretches ot resistance-wire coils 5, hereinafter called the heating elements. 'lhc coils oi these elements lie below the top plane of the trame 2 which has top semicircular recesses 6 torming lugs 7 along inner edges of the trame. The lugs are undercut at 8 to 'form safe retainers for the bends ot the element coils.

The rear side of the trame has a set of three terminals or blade plugs 10 and the heating F element includes duplex coils AHB starting from the central plug 10 (or neutral line N) and ending at the respective outer plug 10, Fi 1.

The plugs 10 are adapted to be plugged into respective spring clip terminals 12 which have stems 11 secured in the wall W which indicates a portion of a steam radiator apparatus.

The neutral line N serves the central plug clip 12 and wires L M serve the outer clips 12 so that should either loop or section A-B of the heating element break, the remainder would still be a hot wire.

Thus the heating element is fully exposed above and below and its radiant heat is effectively transmitted to an enveloping coil or coils ot small water tube 15 wound from end to end over the frame 2.` The ends ot the tube are connected in any suitable manner to water and steam receivers, not here shown. The trame is quite shallow and thus the tubel coils 15 lie close to the hot heating element sections A-B and high etiiciency is secured in heating water in the tube 15.

In event of necessity the whole electric unit can be readily pulled from its connectors 12 and easily replaced.

In Figs. 6, 7 and 8 is shown a three-wire plug socket including a face plate having equiangular plug holes 26 leading into an insulator body 27 in which is mounted three spring clip terminals 28. These have binding stems 29 at the bottom of the insulator' for wires. A shell 30 encloses the insulator and has a flange 31 attached to the back ot the face-plate 25.

Complementary to the socket is a three blade plug having a disc insulator 32 with a set of perpendicular blade plugs 33. These have stems 34 extending through the disc 32 and secured by binding nuts 35. The binding stems 35vare concealed in a. protective hood 36.

What is claimed is:

1. In an electric heater a flat frame of refraetory material, a 'Het system of resistor element with its stretches in a common plane Crossing from side to side of the frame und between its top and bottom faces, and a Water tube lconsisting of a flattened helixI coiled on the frame and in close proximity to opposite `sides of the plane resistor system.

2. In an :electric steam generating unit, a naked resistor member rove to and fro in* :L pinne to form a 'flut grid element, means Supporting the grid in plane form7 and a Water tube forming Velnt helix about the grid With JOHN B. ODELL. 

